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JEE Main Chemistry Class 11 Chemical Thermodynamics Part 1 Questions

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Question : 60

Total: 100

The standard enthalpy of formation (∆fH298∘) for methane, CH4 is −74.9kJmol−1. In order to calculate the average energy given out in the formation of a C−H bond from this it is necessary to know which one of the following?

[Online April 12, 2014]

The dissociation energy of the hydrogen molecule, H2.
The first four ionisation energies of carbon.
The dissociation energy of H2 and enthalpy of sublimation of carbon (graphite).
The first four ionisation energies of carbon and electron affinity of hydrogen.

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